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This article mainly introduces "how to use closures in js". In daily operation, I believe many people have doubts about how to use closures in js. Xiaobian consulted all kinds of information and sorted out simple and easy operation methods. I hope to help you answer the doubts about "how to use closures in js"! Next, please follow the small series to learn together!

1. Encapsulate a private variable with a closure.

Closure is a function that carries state, and its state can be completely hidden outside.

Closures can also convert multi-parameter functions into single-parameter functions.

The returned function references local variables in its definition.

Thus, when a function returns a function, its internal local variables are also referenced by the new function.

examples

function count() { var arr = []; for (var i = 1; i

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